Added C implementation

C/main.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <string.h>
+
+void encryptDecrypt(char *input, char *output) {
+	char key[] = {'K', 'C', 'Q'}; //Can be any chars, and any size array
+	
+	int i;
+	for(i = 0; i < strlen(input); i++) {
+		output[i] = input[i] ^ key[i % (sizeof(key)/sizeof(char))];
+	}
+}
+
+int main (int argc, char *argv[]) {
+	char baseStr[] = "kylewbanks.com";
+	
+	char encrypted[strlen(baseStr)];
+	encryptDecrypt(baseStr, encrypted);
+	printf("Encrypted:%s\n", encrypted);
+	
+	char decrypted[strlen(baseStr)];
+	encryptDecrypt(encrypted, decrypted);
+	printf("Decrypted:%s\n", decrypted);
+}